121 lines
2.2 KiB
Rust
121 lines
2.2 KiB
Rust
use std::{
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cmp::Ordering,
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fmt::{Debug, Display, Formatter},
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ops::{Add, AddAssign, Sub, SubAssign},
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};
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#[derive(Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Default)]
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#[repr(transparent)]
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pub struct Fixed(pub i32);
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impl Fixed {
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pub const EPSILON: Self = Fixed(1);
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pub fn is_integer(self) -> bool {
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self.0 & 255 == 0
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}
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pub fn from_f64(f: f64) -> Self {
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Self((f * 256.0) as i32)
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}
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pub fn from_f32(f: f32) -> Self {
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Self::from_f64(f as f64)
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}
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pub fn to_f64(self) -> f64 {
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self.0 as f64 / 256.0
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}
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pub fn to_f32(self) -> f32 {
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self.0 as f32 / 256.0
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}
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pub fn from_1616(i: i32) -> Self {
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Self(i >> 8)
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}
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pub fn to_int(self) -> i32 {
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self.0 >> 8
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}
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pub fn from_int(i: i32) -> Self {
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Self(i << 8)
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}
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pub fn round_down(self) -> i32 {
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self.0 >> 8
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}
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pub fn apply_fract(self, i: i32) -> Self {
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Self((i << 8) | (self.0 & 255))
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}
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}
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impl PartialEq<i32> for Fixed {
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fn eq(&self, other: &i32) -> bool {
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self.0 == *other << 8
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}
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}
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impl PartialOrd<i32> for Fixed {
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fn partial_cmp(&self, other: &i32) -> Option<Ordering> {
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self.0.partial_cmp(&(*other << 8))
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}
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}
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impl Debug for Fixed {
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fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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Debug::fmt(&self.to_f64(), f)
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}
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}
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impl Display for Fixed {
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fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
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Display::fmt(&self.to_f64(), f)
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}
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}
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impl Sub for Fixed {
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type Output = Self;
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fn sub(self, rhs: Self) -> Self::Output {
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Self(self.0 - rhs.0)
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}
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}
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impl Add for Fixed {
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type Output = Self;
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fn add(self, rhs: Self) -> Self::Output {
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Self(self.0 + rhs.0)
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}
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}
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impl Sub<i32> for Fixed {
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type Output = Self;
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fn sub(self, rhs: i32) -> Self::Output {
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Self(self.0 - (rhs << 8))
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}
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}
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impl Add<i32> for Fixed {
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type Output = Self;
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fn add(self, rhs: i32) -> Self::Output {
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Self(self.0 + (rhs << 8))
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}
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}
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impl AddAssign for Fixed {
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fn add_assign(&mut self, rhs: Self) {
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self.0 += rhs.0;
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}
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}
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impl SubAssign for Fixed {
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fn sub_assign(&mut self, rhs: Self) {
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self.0 -= rhs.0;
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}
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}
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